Four same charges, the value of each q, is located

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Four same charges, the value of q each, are located in the corners of a square with the side a. What is the field strength at a distance 2a from the center of the square on the straight line passing through the center square and parallel to the side?

Task 30646. Detailed solution shorthand terms, formulas, laws used in the decision, the withdrawal of the calculation formula and the response.
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